Campbell Scientific CR1000KD CR800 and CR850 Measurement and Control Systems - Page 153
FieldCal, FieldCalStrain
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Section 7. Installation topics. The most comprehensive resource to date covering use of FieldCal() and FieldCalStrain() is RTDAQ software documentation. Be aware that, • the CR800 does not check for out-of-bounds values in mode variables. • valid mode variable entries are "1" or "4". 7.8.1.4.1 Single-Point Calibrations (zero, offset, or zero basis) Use this single-point calibration procedure to adjust an offset (y-intercept). See Zero (Option 0) (p. 156) and Offset (Option 1) (p. 156) for demonstration programs: 1. Use a separate FieldCal() instruction and separate field cal variables for each sensor to be calibrated. In the CRBasic program , put the FieldCal() instruction immediately below the associated measurement instruction. 2. Set mode variable = 0 or 6 before starting. 3. Place the sensor into zeroing or offset condition. 4. Set KnownVar variable to the offset or zero value. 5. Set mode variable = 1 to start calibration. Mode Variable > 0 and ≠ 6 < 0 2 6 Interpretation calibration in progress calibration encountered an error calibration in process calibration complete. 7.8.1.4.2 Two-point Calibrations (multiplier / gain) Use this two-point calibration procedure to adjust multipliers (slopes) and offsets (y-intercepts). See Two Point Slope and Offset (Option 2) (p. 159) and Two Point Slope Only (Option 3) (p. 161) for demonstration programs: 1. Use a separate FieldCal() instruction and separate, related variables for each sensor to be calibrated. 2. Ensure mode variable = 0 or 6 before starting. a. If Mode > 0 and ≠ 6, calibration is in progress. b. If Mode < 0, calibration encountered an error. 3. Place sensor into first known point condition. 4. Set KnownVar variable to first known point. 5. Set Mode variable = 1 to start first part of calibration. a. Mode = 2 (automatic) during the first point calibration. b. Mode = 3 (automatic) when the first point is completed. 6. Place sensor into second known point condition. 7. Set KnownVar variable to second known point. 153